Concept 55.1  Human activities threaten Earth's biodiversity	55.01
 Concept 55.2  Population conservation focuses on population size, genetic diversity, and critical habitat	55.02
 Concept 55.3  Landscape and regional conservation aim to sustain entire biotas	55.03
 Concept 55.4  Restoration ecology attempts to restore degraded ecosystems to a more natural state	55.04
 Concept 55.5  Sustainable development seeks to improve the human condition while conserving biodiversity	55.05
Graph It: Global Fisheries and Overfishing	frameset-13.html 
Graph It: Global Freshwater Resources	frameset-14.html 
Graph It: Forestation Changes	frameset-16.html 
Graph It: Prospects for Renewable Energy	frameset-18.html 
Graph It: Municipal Solid Waste Trends in the U.S.	frameset-19.html 
Activity: Madagascar and the Biodiversity Crisis	55&A
Activity: Introduced Species: Fire Ants	55&B
Activity: Conservation Biology Review	55&C
Investigation: How Are Potential Prairie Restoration Sites Analyzed?	55&A
Video: Coral Reef	CoralReef-V.html=CoralReef-V.swf